Screw-driver.



B. G. JANSSON.

SCREW DRIVER. APPLICATION FILED mm: 28. 19:5.

Patented Dec. 7, 1915.

BENNETT G. JANSSON, 01E SAUGUS, MASSACHUSETTS, ASSIGNOR T0 BLAKE SIGNAL AND, MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SCREW-DRIVER.

Specification of Letters Patent.

Patented Dec. t, T915.

Application filed June 28, 1915. Serial No. 36.617.

ed to engage the slotted heads of bolts or screws and force them into or out from orifices, internallythreaded or not, in structures of any kind.

A particular object of my present invention is to provide a tool of this character which can not only be employed to set or rea move screws located in small recesses,but to all) also be able to use the tool in substantially the ordinary manner of a screw driver.

To this end my invention consists in the improved tool which I shall now proceed to describe and claim.

Of the accompanying drawings, Figure 1 is a perspective view of my improved tool in one of its embodiments. Figs. 2, 3 and 4 are, respectively, side, edge and top views of the upper end of one end of the tool.

The screw driver as a whole is indicated at A and comprises a shank portion which may be somewhat slender as indicated at a said slender portion having flattened sides f, and enlarged and knurled at 9, one end of said shank being straight and flattened as at it and formed with a screw-engaging ti z. The other end of the tool has a flat sur ace 6 in a plane at substantially a right angle to the longitudinal axis of the shank. This end of the tool is widened laterally and has two projecting tips c and d, the tip 0 being in a plane parallel with the longitudinal axis of the shank and the tip (Z. being in a plane at substantially a right angle thereto. This special structure of the portion 6, c, d, of the tool is of particular advantage in connection with the tip a at the other end of the shank because if the tool is to be employed in the ordinary manner of a screw driver, by engaging the tip 71 with the slotted head of the screw, the user, by grasping the tip 0 between the thumb and middle finger of one hand and pressing the forefinger upon the flat surface b, can exert the necessary pres sure to aid in retaining engagement of the tip 2' with the screw during turning, the tip 0 then serving as a handle to facilitate turning the shank on its axis. That is, the

thumb and middle finger of the hand, by

grasping opposite surfaces of the tip 0, while exerting pressure with the forefinger as described, can exert considerable more turning force upon the shank than could be effected by grasping only a small shank.

The portlon Z), c, d besides serving the purposes above described enables the tool to be employed in driving or loosening a screw located in a recess to which access could not be had by means of the tip a, and when such recess would not permit of the shank being given a complete half swing. In other words, the tip d can be engaged with the slot of a screw head and the shank swung substantially a quarter of a complete cycle,

then the tip d removed and the shank given a half rotation on its axis to enable the tip 0 to be engaged with the slot of the screw head, and then the screw can be given another quarter turn. By swinging the shank back and forth and alternately engaging the tips a, d, with the screw head slot, a screw can be set or removed when such screw is so located that it can not be engaged either by the tip 2', or engaged and successfully operated by eitherone of the tips 0, (1, alone.

Having now described my invention, I claim:

A screw driver comprising a shank having a plurality of fiat tips for engaging screw head slots, one end of the shank terminating in a single tip, the other end of the shank having a pair of tips, one of said pair of tips being in a plane parallel with the longitudinal axis of the shank and the other in a plane at substantially a right angle thereto, the outer face of the last mentioned tip presenting a flat surface to receive vpressure of a finger when the single tip at the other end of the shank is being two subscribing Witnesses, this 26th day of used, the tip Which is in a plane parallel June, 1915.

With the axis of the shank serving then as a handle to facilitate turning the shank on its BENNETT JANSSON' 5 axis. Witnesses: I

In testimony whereof, I have signed my GEO. WILLIS PIERCE,

name to this specification, in the presence of JOHN B. HYNES. 

